On Thu, Jan 03, 2019 at 11:10:00PM +0000, Xavier Trilla wrote:

Hi,

For some route selection configurations I need to check the bgp_path.len without some AS numbers.

I tried something like:

bgp_path.delete(AS_1);

bgp_path.delete(AS_2);

if bgp_path.len < N then ...

But doing this I modify permanently the AS path.

I've tried using a temp variable, but looks like bird doesn't allow to create bgppath "variables".

Hi

Although approach suggested by Alexander Zubkov is applicable,
i would note that BIRD allows bgppath variables, see:

filter testfilter
bgppath pp;
{
 pp = bgp_path;
 pp = prepend(pp, 65500);
 pp = prepend(pp, 65500);
 print pp, " ", pp.len;
 accept;
}

The only think that is strange is that operators like delete or prepend
cannot be used with 'dot-syntax' (i.e. pp.prepend(X)), but must be used
with 'function-syntax' (i.e. pp = prepend(pp, X)).

--
Elen sila lumenn' omentielvo

Ondrej 'Santiago' Zajicek (email: santiago@crfreenet.org)
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"To err is human -- to blame it on a computer is even more so."